Saheeli Rai targets Felidar Guardian for the loop. If I in responce to them targeting the Guardian, cast Aether Meltdown, would the copy become a 0/4 or remain a 1/4?
It will be a 1/4.
When a token copy of a permanent is created, effects like Aether Meltdown and other effects that modify its characteristics aren’t considered. The permanent is copied as its printed, with only other copy effects (e.g. Clone) being taken into account here.











